Asus ZD553KL Service Manual page 46

L3 Service Manual
1. Check that the WIFI / BT/GPS antenna is in good contact with the contact shrapnel position.
2. Check the WIFI / BT RF front-end circuit is normal, you can use the signal generator from the ANT
input signal generated 2.4 G and 5 G, use the spectrum analyzer to check whether the normal RF
channel
3. Check WIFI / BT, RF circuit operating voltage is normal, if abnormal check PMU
4. Check the CPU and circuit between the WIFI TX RF signal, RX, CTRL, you can change the
continuous U2900 and U1500, to confirm whether the welding is good.
5. Check GPS RF signals between the CPU and RX, CTRL, can change of successive
U2900 and CPU confirm welding and device performance.
2017-06-08
ZD553KL - 46 -